should discard
Regular verb: discard - discarded- discarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd discard
you'd discard
she'd discard
we'd discard
you'd discard
they'd discard 	I'd be discarding
you'd be discarding
she'd be discarding
we'd be discarding
you'd be discarding
they'd be discarding	I should've discarded
you should've discarded
she should've discarded
we should've discarded
you should've discarded
they should've discarded	I should've been discarding
you should've been discarding
she should've been discarding
we should've been discarding
you should've been discarding
they should've been discarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't discard
you shouldn't discard
she shouldn't discard
we shouldn't discard
you shouldn't discard
they shouldn't discard 	I shouldn't be discarding
you shouldn't be discarding
she shouldn't be discarding
we shouldn't be discarding
you shouldn't be discarding
they shouldn't be discarding	I shouldn't have discarded
you shouldn't have discarded
she shouldn't have discarded
we shouldn't have discarded
you shouldn't have discarded
they shouldn't have discarded	I shouldn't have been discarding
you shouldn't have been discarding
she shouldn't have been discarding
we shouldn't have been discarding
you shouldn't have been discarding
they shouldn't have been discarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I discard?
should you discard?
should she discard?
should we discard?
should you discard?
should they discard? 	should I be discarding?
should you be discarding?
should she be discarding?
should we be discarding?
should you be discarding?
should they be discarding? 	should I have discarded?
should you have discarded?
should she have discarded?
should we have discarded?
should you have discarded?
should they have discarded? 	should I have been discarding?
should you have been discarding?
should she have been discarding?
should we have been discarding?
should you have been discarding?
should they have been discarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I discard?
shouldn't you discard?
shouldn't she discard?
shouldn't we discard?
shouldn't you discard?
shouldn't they discard? 	shouldn't I be discarding?
shouldn't you be discarding?
shouldn't she be discarding?
shouldn't we be discarding?
shouldn't you be discarding?
shouldn't they be discarding? 	shouldn't I have discarded?
shouldn't you have discarded?
shouldn't she have discarded?
shouldn't we have discarded?
shouldn't you have discarded?
shouldn't they have discarded? 	shouldn't I have been discarding?
shouldn't you have been discarding?
shouldn't she have been discarding?
shouldn't we have been discarding?
shouldn't you have been discarding?
shouldn't they have been discarding?